pre_build.py: remove CONFIG_BT_ENABLED from sdkconfig patching (fixes BT pre-init conflict with USB)

pre_build.py

@@ -70,8 +70,9 @@ def patch_sdkconfig_bt():
         content = f.read()
 
     defines = {
-        "CONFIG_BT_ENABLED": 1,
-        "CONFIG_BT_NIMBLE_ENABLED": 1,
+        # Do NOT set CONFIG_BT_ENABLED here — that forces the Arduino
+        # framework to pre-init the BT controller at startup, which
+        # conflicts with USB. NimBLEDevice::init() handles its own init.
         "CONFIG_BTDM_CTRL_MODE_BLE_ONLY": 1,
         "CONFIG_BT_NIMBLE_MAX_CONNECTIONS": 1,
         "CONFIG_BT_NIMBLE_TASK_STACK_SIZE": 6144,

src/main.cpp

@@ -346,10 +346,9 @@ void setup() {
     switch_driver.set_mux(&mux);
     switch_driver.begin();
     
-    // BLE disabled for crash diagnosis
-    // Serial.println("[INIT] Initializing BLE MIDI...");
-    // delay(1000);
-    // ble_midi_transport.begin();
+    Serial.println("[INIT] Initializing BLE MIDI...");
+    delay(1000);
+    ble_midi_transport.begin();
 
     Serial.println("[INIT] Initializing USB MIDI...");
     midi_transport.begin();